Over 100,000,000 Wonderful Users
Ending 502 Proxy Error 12156 through SmartPCFixer.
Applies To: Windows 10 | Windows 8 | Windows 7 | Windows Vista | Windows XP


Windows along with other critical errors can occur when your Windows platform becomes corrupted. Launching programs is going to be slower and response time will decline. If you have various applications running, you could experience crashes and freezes. For example, you may encounter 502 Proxy Error 12156 errors when your computer is not steady.


In most situations, 502 Proxy Error 12156 issue arises while your pc system is not stable and critical system files are unable to respond or starts missing. 502 Proxy Error 12156 error occurs if your system lack of regular maintenance. To prevent further damage, you should resolve this error right away.


There may be multiple reasons behind 502 Proxy Error 12156 error, such as:

  • excessive startup entries
  • registry errors
  • hardware/RAM decline
  • fragmented files
  • superfluous program installations, etc

Download the Windows repair tool

A good usage habit will help a lot to keep your computer system stable. When 502 Proxy Error 12156 error occur to your computer, you can get plenty of methods to correct it on the internet, but a few of these need you realize some professional knowledge or hard to understand, and there are some common simple ways but sometimes your problems just can't be resolved.
For ordinary people, I will suggest to use 502 Proxy Error 12156 Error Fixer to fix this error, it really is an effcient tool which could fix all common errors in 5 mintues with simple clicks.

File Size: 6 MB
Compatible: Windows XP, Vista, 7 (32/64 bit), 8 (32/64 bit), 8.1 (32/64 bit), 10
License: Free evaluation version. To unlock all features and tools, a purchase is required.
Downloads: 361,927
How to fix 502 Proxy Error 12156 automatically?
  • 1. Click below button to download SmartPCFixer.
  • 2. Launch the Smart PC Fixer tool and make a detailed scan for your computer or laptop.
  • 3. Click [ Fix All ] to resolve the "502 Proxy Error 12156". Download SmartPCFixer here.

How to fix 502 Proxy Error 12156 Manually ?
Step 1. Uninstall Suspicious Application.
  • Click "Start" Button, clicking Control Panel;
  • manually fix 502 Proxy Error 12156

  • Find "Program and Function" option and click;
  • program_win7

  • Choose the app you want to uninstall and double click.
  • 502 Proxy Error 12156 fixing step3

Step 2, Run System File Checker to fix "502 Proxy Error 12156" error:
  • Press Win+R button on your keyboard;
  • Type "cmd", press "Enter";
  • Type SFC /SCANNOW in the command window;
  • Press ENTER.

Note: System File Checker is a tool in windows that enables customers to check for corruptions in windows system files and restore corrupted files.Please do not close this Command Prompt window till the verification is 100% complete. The scan results will be shown right after this process is finished.
Step 3. After step 2, you will get system messages that tell you system files are fixed successfully. Or if you are told there are still other errors need to be repaired, then you may need to try an automatic fixing tool -- SmartPCFixer.

Warm Tips
  • You must run as an administrator, no matter what steps you will do about your PC.
  • Depending on your computer windows system, the above steps may be slightly different, but the basic process is mostly the same.